Rheem PROG40-36N RH62 MH DVX

The registry does not print the 185 therms figure. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.6 for this model. The second input is the DOE test's daily hot-water draw for the medium draw pattern. That pattern stands for a typical mid-sized household with a busy morning. The UEF comes from the DOE Compliance Certification Database, retrieved 2026-09-19. So the result holds only at the federal test's daily draw, with natural gas as the fuel. Your household's actual hot-water use is not available in the data, so real use can differ from 185 therms. The steps are set out in how the annual energy and cost figures are calculated.

Against its class, this unit's energy use equals the median. The 288 models registered as a gas tank at the medium draw pattern have a median of 185 therms. This model differs from that median by 0 therms, and it ranks 89th lowest energy use of 288. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 63 gallons. Its rated volume is 38 gallons. These figures fit a household that matches the medium pattern. A home that draws more hot water than that pattern falls outside the tested condition, and this page has no figure for it. To check units in the same class, use the same-class replacement finder by model number.

Running cost is not written here as a figure, because it depends on your own gas rate. The page combines 185 therms with your state's average residential gas price, which it looks up from your ZIP. Enter your ZIP in the running cost calculator to see the result at the medium draw pattern. The installed-price range appears in its own block, with its source and date. That range is a modeled installed cost, not a quote. If you are comparing this 0.6 UEF gas tank with another fuel or size, the water heater selector by fuel, space and size covers other classes.